[deathman53]

I rebuilt my 250r motor this week. The bottom end was rebuilt last year, I had the cyinder honed and got new piston kit, gaskets and o-rings. Cleaned and rebuilt the powervalve. Put it together, turned over fine, today I put the new powervalve parts on, still spun over fine. Put the motor in my trike, oil, coolant, gas tank, plastic, leaving the only thing left to do in gas it up. Go to kick it and the kicker moves about 5" and its locked. Tore it down, the piston was hard to get out, metal shavings in the crank case. Look a the cylinder in better light and it also needs to be re-plated. Where the piston stuck, it gouged the cylinder wall. Great news. Don't understand, how, why inside such a short time did this happen. I've rebuilt many motors, this isn't my first. I didn't take apart the clutch side yet, when I put a new clutch, springs and bolts in, it was mint.

 

[lilredridenwood]

dude that sucks!! I rebuilt mine over the winter. Had about 10 hrs on it and the powervalve fell apart and dropped into my cylinder. locked it up quick. still waiting on my cylinder to get back from ESR they are making a spacer plate so that problem will never happen again.

 

[Michael88R]

dude that sucks!! I rebuilt mine over the winter. Had about 10 hrs on it and the powervalve fell apart and dropped into my cylinder. locked it up quick. still waiting on my cylinder to get back from ESR they are making a spacer plate so that problem will never happen again.

What is the spacer going to do? Are you just blocking it off?

 

[lilredridenwood]

What is the spacer going to do? Are you just blocking it off?

my bad i meant to say block off plate! I was drinking last night

 

[blasterman88]

we built a few spacers to block off the PV, thats the only way IMO, not a fan of the PV's anyways, cause unless you know how to tune them, they dont work to full potential.....and most people do not know how to set them up..